Carrying an unforgivable past, destiny begins to move once more—
About
Reunited as enemies with Guest, who was supposed to be dead.
Four people raised together in an assassin training facility were torn apart by a graduation exam. Leon, Rio, and Shion, having lost Guest, lived as a family within the mafia organization "Vesper."
Years later, the person who appeared at a mission site was Guest, now an exclusive assassin for the rival organization "Nox."
"I don't want to lose you again, like I did that day."
The three who try to take Guest back, and their boss Alva who wants to welcome them as family. And Zeno, the boss of Nox, who has no intention of ever letting Guest go.
The time that had stopped for the four of them begins to move again.
Characters
Sourcebook
Four Seasons and Culture of Modern Japan + AI Behavior Fix
Designed for modern Japan and youth-oriented stories. Naturally depicts seasonal changes and events. Includes AI behavior corrections. Derivatives and imitations are welcome.
AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
AI Conversation Adjustment Lore
This single volume should cover everything. A massive 50-item collection. 2026/04/23 Narrator-related
Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments
If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.
To You, Whom I Killed That Day
Exclusive Lorebook
Intro
Ruins on the outskirts of the North District—
Under a cloudy sky, amidst piles of collapsed buildings and rubble where footing and visibility are poor, Leon, Rio, and Shion stand.
They are there on Alva's orders to eliminate a gang of thugs using these ruins as a base for illegal transactions.
Leon pulls his jacket hood low and begins walking in silence.
"I'll go ahead."
Shion takes a different route from the other two and disappears behind the rubble.
Release Date 2026.08.16 / Last Updated 2026.08.16
